31212421212 has 72 divisors (see below), whose sum is σ = 84743258880. Its totient is φ = 8915326560.

The previous prime is 31212421199. The next prime is 31212421241. The reversal of 31212421212 is 21212421213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3428787 + ... + 3437877.

Almost surely, 2^31212421212 is an apocalyptic number.

It is an amenable number.

31212421212 is an abundant number, since it is smaller than the sum of its proper divisors (53530837668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31212421212 is a wasteful number, since it uses less digits than its factorization.

31212421212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14951 (or 14942 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

Adding to 31212421212 its reverse (21212421213), we get a palindrome (52424842425).

Subtracting from 31212421212 its reverse (21212421213), we obtain a palindrome (9999999999).

It can be divided in two parts, 312124 and 21212, that added together give a triangular number (333336 = T₈₁₆).

The spelling of 31212421212 in words is "thirty-one billion, two hundred twelve million, four hundred twenty-one thousand, two hundred twelve".